Underground composite electrode steam heating device for oil field thickened oil exploitation
The purification and cleaning measures of the downhole composite electrode steam heating device have solved the problem of scale accumulation in the electrode tubes, and ensured a stable supply of steam and long-term efficient operation of the equipment during heavy oil extraction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- KUNLUN CLEAN ENERGY (SUZHOU) EQUIPMENT CO LTD
- Filing Date
- 2026-03-19
- Publication Date
- 2026-04-28
AI Technical Summary
During long-term use, scale easily accumulates on the outer wall of the electrode tubes in existing electrode boilers, leading to reduced heat transfer efficiency and equipment damage, making it difficult to meet the high-end steam injection requirements of heavy oil extraction.
The well-mounted composite electrode steam heating device uses a purification treatment mechanism and water supply components in the water tank to purify the cooling water and inhibit scale formation. At the same time, the outer wall of the electrode tube is cleaned by a stirring shaft and a cleaning brush. Combined with a power regulation module to optimize power supply, the device ensures steam quality and stable operation.
It effectively inhibits scale formation, improves the heating efficiency of the electrode tube, reduces the risk of equipment damage, and ensures a stable supply of steam during heavy oil extraction.
Smart Images
Figure CN121932149A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of heavy oil extraction technology, and in particular to a downhole composite electrode steam heating device for heavy oil extraction. Background Technology
[0002] High-temperature, high-pressure steam is the core production medium in heavy oil extraction and various industrial production processes. Due to the high viscosity and poor fluidity of heavy oil, high-temperature and high-pressure steam needs to be injected to reduce viscosity and improve recovery rate in the field of heavy oil extraction. Currently, the mainstream steam injection technology in the industry mainly relies on traditional electrode boilers. Although traditional electrode boilers can utilize electrical energy and are in line with the direction of clean energy, they have many core technical bottlenecks and cannot meet the high-end steam injection needs of industry.
[0003] In existing electrode boilers, a lot of scale will accumulate on the outer wall of the electrode tube during long-term use. Scale buildup not only reduces the heat transfer efficiency of the electrode tube, but also easily causes damage to the electrode tube, thus affecting the overall operation of the equipment. Summary of the Invention
[0004] This application provides a downhole composite electrode steam heating device for heavy oil development in oilfields, which can reduce the possibility of scale formation on the outer wall of the composite electrode tube during long-term operation, ensure the heating effect of the composite electrode tube on the cooling water, and reduce the possibility of damage to the composite electrode tube.
[0005] This application provides a downhole composite electrode steam heating device for heavy oil extraction in oilfields, which adopts the following technical solution: A downhole composite electrode steam heating device for heavy oil development in oilfields includes an electrode boiler; the electrode boiler is equipped with composite electrode tubes arranged in a circumferential array inside, and a steam pipe and a three-phase AC power supply are installed on the top surface of the boiler; the three-phase AC power supply is electrically connected to the composite electrode tubes; a water tank is installed on one side of the electrode boiler; a water injection pipe is installed on the top surface of the water tank, and a water purification treatment mechanism is installed inside the water tank; a water conveying assembly is installed outside the electrode boiler to transport water from the water tank to the electrode boiler.
[0006] By adopting the above technical solution, cooling water to be added to the electrode boiler is added to the water tank through the water injection pipe. The cooling water is purified by the treatment mechanism and then transported to the electrode boiler through the water conveying assembly. Three-phase AC power supplies power to the composite electrode tube through the circuit. The composite electrode tube heats the cooling water, and the steam generated by heating is transported out through the steam pipe for heavy oil extraction. The treatment mechanism can reduce the possibility of scale formation on the outer wall of the composite electrode tube during long-term operation, thereby ensuring the heating effect of the composite electrode tube on the cooling water and reducing the possibility of damage to the composite electrode tube.
[0007] Preferably, a partition is horizontally installed inside the water tank; the partition divides the internal space of the water tank into upper and lower parts, a treatment chamber and a filtration chamber, and a connecting pipe is provided on the partition to connect the treatment chamber and the filtration chamber; a valve is provided on the connecting pipe; the treatment mechanism includes a metering pump and a filter screen; the metering pump is located on the outer wall of the water tank, with an inlet pipe at the input end of the metering pump and an outlet pipe at the output end of the metering pump that communicates with the treatment chamber; the inlet pipe can be connected to a scale inhibitor; the filter screen is installed on the inner wall of the filtration chamber.
[0008] By adopting the above technical solution, when purifying cooling water, the inlet pipe is connected to the scale inhibitor. After starting the metering pump, the scale inhibitor can be delivered to the treatment chamber to react with the cooling water, inhibiting the formation of crystalline scale in the cooling water and reducing the possibility of scale formation during the heating process. After the reaction is complete, the valve on the connecting pipe is opened, and the cooling water enters the filter chamber through the connecting pipe. The filter screen then filters the cooling water to remove impurities, thus achieving the purification of the cooling water.
[0009] Preferably, the water supply assembly includes a water pump; the water pump is installed on the outer wall of the electrode boiler, the water pump input end is provided with a water inlet pipe communicating with the inside of the filter chamber, and the water pump output end is provided with a water outlet pipe communicating with the inside of the electrode boiler.
[0010] By adopting the above technical solution, the water pump can be started to extract the cooling water from the filter chamber, and then the cooling water can be transported to the electrode boiler through the inlet and outlet pipes, thus conveniently realizing the work of adding cooling water to the electrode boiler.
[0011] Preferably, a first motor is installed on the outer wall of the water tank; a stirring shaft extending horizontally into the processing chamber is coaxially fixed to the output end of the first motor; and a stirring plate is fixed to the outer wall of the stirring shaft.
[0012] By adopting the above technical solution, when the scale inhibitor is added and reacts with the cooling water, the first motor is started to drive the stirring shaft to rotate, which causes the stirring plate to stir the mixture, so that the cooling water and the scale inhibitor can react fully, accelerate the reaction rate of the cooling water and the scale inhibitor, and ensure the treatment effect of the cooling water.
[0013] Preferably, a liquid level sensor is provided on the top wall of the processing chamber; a controller electrically connected to the liquid level sensor is provided on the top surface of the water tank; the controller is electrically connected to the metering pump and controls the operation of the metering pump.
[0014] By adopting the above technical solution, when adding scale inhibitor, the level sensor can detect the level of cooling water in the treatment chamber and transmit the detection result to the controller. The controller controls the metering pump to work so as to meter and deliver the scale inhibitor according to the level of cooling water, so as to ensure the treatment effect of cooling water.
[0015] Preferably, a second motor is installed on the outer wall of the water tank; a first reciprocating screw extending horizontally into the filter chamber is coaxially fixed to the output end of the second motor; the first reciprocating screw is located at the top of the filter screen, and a cleaning brush that slides and engages with the inner wall of the filter chamber is sleeved on the outside of the first reciprocating screw; the cleaning brush is threadedly engaged with the first reciprocating screw and contacts the top surface of the filter screen; the water tank has discharge ports flush with the top surface of the filter screen on the side walls at both ends of the first reciprocating screw.
[0016] By adopting the above technical solution, starting the second motor can drive the first reciprocating screw to rotate, causing the cleaning brush to move along the axial direction of the first reciprocating screw, sweeping the impurities accumulated on the filter screen to the discharge port, so as to clean the impurities on the surface of the filter screen and reduce the possibility of the filter screen mesh being blocked by impurities.
[0017] Preferably, the composite electrode tube is coaxial with the first reciprocating lead screw; a second reciprocating lead screw, coaxial with the first reciprocating lead screw, is horizontally rotatably connected to the inner wall of the electrode boiler; a sliding plate, threadedly engaged with the second reciprocating lead screw, is sleeved on the outside of the second reciprocating lead screw; multiple scraper rings are fixedly connected to the outer wall of the sliding plate via connecting rods; the multiple scraper rings are respectively sleeved on the outside of multiple composite electrode tubes, and the scraper rings slide in engagement with the outer wall of the composite electrode tubes; a transmission assembly capable of driving the second reciprocating lead screw to rotate is provided at the end of the first reciprocating lead screw.
[0018] By adopting the above technical solution, the first reciprocating screw will drive the second reciprocating screw to rotate through the transmission component during the rotation of the first reciprocating screw, causing the slide plate to move along the axial direction of the second reciprocating screw. During the movement of the slide plate, the scraper ring will move along the outer wall of the composite electrode tube and scrape its outer wall, reducing the possibility of scale buildup on the outer wall of the composite electrode tube and ensuring the heating effect of the composite electrode tube on the cooling water in the electrode boiler.
[0019] Preferably, the transmission assembly includes a first pulley, a second pulley, and a belt; the first pulley is coaxially fixed to the outer wall of the end of the first reciprocating screw; the second pulley is coaxially fixed to the outer wall of the end of the second reciprocating screw; and the belt is sleeved on the outside of the first pulley and the second pulley.
[0020] By adopting the above technical solution, with the cooperation of the first pulley, the second pulley and the belt, the first reciprocating screw will drive the second reciprocating screw to rotate during the rotation process, thereby realizing the transfer of kinetic energy during the rotation of the first reciprocating screw.
[0021] Preferably, the second reciprocating screw has straight plates installed on the outer walls near both ends.
[0022] By adopting the above technical solution, the second reciprocating screw will drive the straight plate to stir the water in the motor boiler during the rotation process, so that the composite electrode tube can heat the water evenly and reduce the possibility of water temperature stratification.
[0023] Preferably, a power regulation module is provided on the top surface of the electrode boiler; the power regulation module is connected in series in the circuit of the three-phase AC power supply and the composite electrode tube.
[0024] By adopting the above technical solution, the power regulation module monitors steam parameters and heating status in real time, flexibly adjusts output power and voltage level to ensure stable steam quality, and adapts to the steam injection requirements of different scenarios, ensuring long-term stable and efficient operation of the device.
[0025] In summary, this application has the following beneficial effects: 1. The cooling water is purified by the treatment mechanism to inhibit the formation of crystal scale in the cooling water, reduce the possibility of scale formation during the heating process, ensure the heating effect of the composite electrode tube on the cooling water, and reduce the possibility of damage to the composite electrode tube. The purified cooling water is then transported to the electrode boiler through the water supply assembly. The three-phase AC power supply provides power to the composite electrode tube through the circuit. The composite electrode tube heats the cooling water, and the steam generated by heating is transported out through the steam pipe for heavy oil extraction. 2. When the scale inhibitor is added and reacts with the cooling water, the first motor is started to drive the stirring shaft to rotate, which causes the stirring plate to stir the mixture, so that the cooling water and the scale inhibitor can react fully, accelerate the reaction rate of the cooling water and the scale inhibitor, and ensure the treatment effect of the cooling water. 3. Starting the second motor can drive the first reciprocating screw to rotate, causing the cleaning brush to move along the axial direction of the first reciprocating screw, sweeping the impurities accumulated on the filter screen to the discharge port, so as to clean the impurities on the surface of the filter screen and reduce the possibility of the filter screen mesh being blocked by impurities. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of a downhole composite electrode steam heating device used in heavy oil extraction in oil fields. Figure 2 This is a schematic diagram of the internal structure of the electrode boiler in this application; Figure 3 This is a schematic diagram of the internal structure of the water tank in this application; Figure 4 This is a schematic diagram of the transmission and engagement structure of the first reciprocating lead screw and the second reciprocating lead screw in this application; Figure 5 This is a schematic diagram of the cooperative structure of the sliding plate and multiple scraper rings in this application.
[0027] Explanation of reference numerals in the attached drawings: 1. Electrode boiler; 11. Steam pipe; 12. Three-phase AC power supply; 13. Second reciprocating screw; 131. Straight plate; 14. Slide plate; 15. Connecting rod; 16. Scraper ring; 2. Composite electrode tube; 3. Water tank; 31. Water injection pipe; 32. Baffle plate; 33. Connecting pipe; 34. Liquid level sensor; 35. Controller; 36. Discharge port; 4. Processing mechanism; 41. Metering pump; 411. Liquid inlet pipe; 412. Liquid outlet pipe; 42. Filter screen; 5. Water conveying assembly; 51. Water pump; 52. Water inlet pipe; 53. Water outlet pipe; 6. First motor; 61. Stirring shaft; 62. Stirring plate; 7. Second motor; 71. First reciprocating screw; 72. Cleaning brush; 73. Transmission assembly; 731. First pulley; 732. Second pulley; 733. Belt; 8. Power adjustment module. Detailed Implementation
[0028] The present invention will be further described in detail below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," "lower," "bottom," and "top" used in the following description refer to directions in the drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.
[0029] This invention discloses a downhole composite electrode steam heating device for heavy oil extraction in oil fields, such as... Figure 1 and Figure 2 As shown, the device includes an electrode boiler 1, a water tank 3, and a water conveying assembly 5. Multiple composite electrode tubes 2 are horizontally arranged inside the electrode boiler 1 in a circular array. A steam pipe 11 and a three-phase AC power supply 12 are installed on the top surface of the electrode boiler 1. The three-phase AC power supply 12 is electrically connected to the composite electrode tubes 2 to supply power. The water tank 3 is located on one side of the electrode boiler 1, and a water injection pipe 31 communicating with the interior of the water tank 3 is installed on its top surface. The water tank 3 is used to store purified cooling water. The water conveying assembly 5 is located on the top surface of the electrode boiler 1 and can transport the cooling water stored in the water tank 3 to the electrode boiler 1.
[0030] Cooling water is added to the water tank 3 through the water injection pipe 31. After the cooling water is purified in the water tank 3, the water supply component 5 delivers the cooling water to the electrode boiler 1. The three-phase AC power supply 12 supplies power to the composite electrode tube 2, which heats the cooling water. The steam generated by heating is delivered through the steam pipe 11 and can be used for heavy oil extraction.
[0031] like Figure 1 and Figure 2As shown, a power regulation module 8 is provided on the top surface of the electrode boiler 1. The power regulation module 8 is connected in series in the circuit between the three-phase AC power supply 12 and the composite electrode tube 2. The power regulation module 8 is existing technology and will not be described in detail here.
[0032] The power regulation module 8 monitors steam parameters and heating status in real time, flexibly adjusts output power and voltage level to ensure stable steam quality, and adapts to the steam injection requirements of different scenarios to ensure long-term stable and efficient operation of the device.
[0033] like Figure 1 and Figure 3 As shown, a partition 32 is horizontally fixed to the inner wall of the water tank 3. The partition 32 divides the internal space of the water tank 3 into two parts: a treatment chamber and a filtration chamber. A connecting pipe 33 is provided on the partition 32 to connect the treatment chamber and the filtration chamber. A valve is provided on the connecting pipe 33. The water tank 3 is also equipped with a treatment mechanism 4 for purifying the cooling water. The treatment mechanism 4 includes a metering pump 41 and a filter screen 42. The metering pump 41 is installed on the top surface of the water tank 3. An inlet pipe 411 is fixed to the input end of the metering pump 41. The inlet pipe 411 can be connected to an external scale inhibitor solution. An outlet pipe 412 is fixed to the output end of the metering pump 41 and is connected to the treatment chamber. The filter screen 42 is horizontally installed on the inner wall of the filtration chamber near the top.
[0034] When purifying the cooling water, the inlet pipe 411 is connected to the scale inhibitor. The scale inhibitor is delivered into the treatment chamber by starting the metering pump 41. It reacts with the cooling water to inhibit the formation of crystal scale in the cooling water and reduce the possibility of scale formation during the heating process. After the reaction is complete, the valve on the connecting pipe 33 is opened, and the cooling water enters the filter chamber through the connecting pipe 33. The filter screen 42 then filters the cooling water to remove impurities and particles, thus purifying the cooling water.
[0035] like Figure 1 and Figure 3 As shown, a liquid level sensor 34 is installed on the top wall of the processing chamber, and a controller 35 is installed on the top surface of the water tank 3. The input end of the controller 35 is electrically connected to the liquid level sensor 34, and the output end of the controller 35 is electrically connected to the metering pump 41. A first motor 6 is horizontally installed on the outer wall of the water tank 3. A stirring shaft 61 extending into the processing chamber is coaxially fixed to the output end of the first motor 6. A pair of stirring plates 62 are fixed to the outer wall of the stirring shaft 61.
[0036] When treating cooling water, the level sensor 34 can detect the level of cooling water in the treatment chamber, and the level controller 35 controls the metering pump 41 to add a matching amount of scale inhibitor to the treatment chamber. When the scale inhibitor and cooling water are mixed and reacted, the first motor 6 is started to drive the stirring shaft 61 to rotate, which causes the stirring plate 62 to stir the mixture, accelerate the reaction rate of cooling water and scale inhibitor, and ensure the treatment effect of cooling water.
[0037] like Figure 1 and Figure 2 As shown, the water supply assembly 5 includes a water pump 51, which is installed on the top surface of the electrode boiler 1. The water pump 51 has an inlet pipe 52 connected to the filter chamber at its input end and an outlet pipe 53 connected to the electrode boiler 1 at its output end.
[0038] If the water pump 51 is started, the cooling water in the filter chamber can be extracted, and then the cooling water can be transported to the electrode boiler 1 through the inlet pipe 52 and the outlet pipe 53, so as to conveniently realize the cooling water addition work of the electrode boiler 1.
[0039] like Figure 1 and Figure 3 As shown, a second motor 7 is horizontally installed on the outer wall of the water tank 3. The output end of the second motor 7 is coaxially fixed to a first reciprocating screw 71 that extends horizontally to the top of the filter screen 42. A cleaning brush 72 is sleeved on the outside of the first reciprocating screw 71 and is threadedly driven to engage with the first reciprocating screw 71. The cleaning brush 72 slides with the inner wall of the filter chamber and contacts the top surface of the filter screen 42. The water tank 3 has discharge ports 36 on the side walls at both ends of the first reciprocating screw 71. The bottom surface of the discharge port 36 is flush with the top surface of the filter screen 42.
[0040] When cleaning the surface of the filter screen 42, the second motor 7 is started to drive the first reciprocating screw 71 to rotate. The cleaning brush 72 moves along the axial direction of the first reciprocating screw 71 to sweep the impurities accumulated on the filter screen 42 to the discharge port 36, thereby reducing the possibility of the mesh of the filter screen 42 being blocked by impurities and ensuring the filtration effect of the filter screen 42.
[0041] like Figure 2 , Figure 4 and Figure 5 As shown, the first reciprocating screw 71 is coaxial with the composite electrode tube 2. The second reciprocating screw 13 is horizontally rotatably connected to the inner wall of the electrode boiler 1. The second reciprocating screw 13 is coaxial with the first reciprocating screw 71 and located on the inner circumference of multiple composite electrode tubes 2. A sliding plate 14 is sleeved on the outside of the second reciprocating screw 13 and threadedly engaged with the second reciprocating screw 13. A scraper ring 16 is fixedly connected to the connecting rod 15 on the outer wall of the sliding plate 14. Multiple scraper rings 16 are respectively sleeved on the outside of multiple composite electrode tubes 2. The scraper rings 16 are slidably engaged with the outer wall of the composite electrode tube 2. A transmission component 73 that can drive the second reciprocating screw 13 to rotate is provided at the end of the first reciprocating screw 71. The transmission assembly 73 includes a first pulley 731, a second pulley 732, and a belt 733. The first pulley 731 is coaxially fixed to the outer wall of the end of the first reciprocating screw 71, and the second pulley 732 is coaxially fixed to the outer wall of the end of the second reciprocating screw 13. The belt 733 is tensioned and sleeved on the outside of the first pulley 731 and the second pulley 732, driving the first pulley 731 and the second pulley 732 to move together.
[0042] With the coordinated operation of the first pulley 731, the second pulley 732, and the belt 733, the first reciprocating screw 71 rotates, which drives the second reciprocating screw 13 to rotate. This causes the slide plate 14 to move along the axial direction of the second reciprocating screw 13, thereby allowing the scraper ring 16 to move along the outer wall of the composite electrode tube 2 and scrape its outer wall, reducing the possibility of scale buildup on the outer wall of the composite electrode tube 2 and ensuring the heating effect of the composite electrode tube 2 on the cooling water inside the electrode boiler 1.
[0043] like Figure 2 and Figure 4 As shown, the second reciprocating screw 13 has a pair of straight plates 131 fixedly connected to the outer wall near both ends.
[0044] During the rotation of the second reciprocating screw 13, the straight plate 131 will drive the water in the motor boiler to stir, so that the composite electrode tube 2 can heat the water evenly and reduce the possibility of water temperature stratification.
[0045] Working principle: Cooling water is added to the treatment chamber of water tank 3 through water injection pipe 31. Liquid level sensor 34 detects the liquid level of cooling water in the treatment chamber. Controller 35 controls metering pump 41 to add a matching amount of scale inhibitor to the treatment chamber. The first motor 6 is started to drive stirring shaft 61 and stirring plate 62 to rotate, so that cooling water and scale inhibitor can react fully, inhibiting the formation of crystal scale in cooling water and reducing the possibility of scale formation during the heating process. After the reaction is completed, the valve on connecting pipe 33 is opened, so that the liquid in the treatment chamber enters the filter chamber and is filtered by filter screen 42 to remove particulate impurities. When electrode boiler 1 needs to add cooling water to generate hot steam, water pump 51 is started to transport the treated cooling water in the filter chamber to electrode boiler 1. Three-phase AC power supply 12 supplies power to composite electrode tube 2 through circuit. Composite electrode tube 2 heats cooling water. The steam generated by heating is discharged through steam pipe 11 for heavy oil extraction. After the filter screen 42 has been filtering for a long time, starting the second motor 7 can drive the first reciprocating screw 71 to rotate, causing the cleaning brush 72 to move along the axial direction of the first reciprocating screw 71, sweeping the impurities accumulated on the filter screen 42 to the discharge port 36, so as to clean the impurities on the surface of the filter screen 42 and reduce the possibility of the mesh of the filter screen 42 being blocked by impurities. With the coordinated operation of the first pulley 731, the second pulley 732, and the belt 733, the first reciprocating screw 71 rotates, which drives the second reciprocating screw 13 to rotate. This causes the slide plate 14 to move along the axial direction of the second reciprocating screw 13, and drives the scraper ring 16 to move along the outer wall of the composite electrode tube 2 to clean its outer wall, reducing the possibility of scale buildup on the outer wall of the composite electrode tube 2 and ensuring the heating effect of the composite electrode tube 2 on the cooling water inside the electrode boiler 1.
[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A downhole composite electrode steam heating device for heavy oil development in oilfields, characterized in that: The system includes an electrode boiler (1); the electrode boiler (1) is equipped with composite electrode tubes (2) arranged in a circular array inside, and a steam pipe (11) and a three-phase AC power supply (12) are provided on the top surface of the electric boiler; the three-phase AC power supply (12) is electrically connected to the composite electrode tubes (2); a water tank (3) is provided on one side of the electrode boiler (1); a water injection pipe (31) is provided on the top surface of the water tank (3), and a water purification mechanism (4) is provided inside the water tank (3); a water conveying assembly (5) is provided outside the electrode boiler (1) to convey water from the water tank (3) to the electrode boiler (1).
2. The downhole composite electrode steam heating device for heavy oil development in oilfields according to claim 1, characterized in that: A partition (32) is horizontally installed inside the water tank (3); the partition (32) divides the internal space of the water tank (3) into two parts, a treatment chamber and a filtration chamber. A connecting pipe (33) is provided on the partition (32) to connect the treatment chamber and the filtration chamber; a valve is provided on the connecting pipe (33); the treatment mechanism (4) includes a metering pump (41) and a filter screen (42); the metering pump (41) is installed on the outer wall of the water tank (3), the input end of the metering pump (41) is provided with an inlet pipe (411), and the output end of the metering pump (41) is provided with an outlet pipe (412) that communicates with the treatment chamber; the inlet pipe (411) can be connected to a scale inhibitor; the filter screen (42) is installed on the inner wall of the filtration chamber.
3. The downhole composite electrode steam heating device for heavy oil development in oilfields according to claim 2, characterized in that: The water supply assembly (5) includes a water pump (51); the water pump (51) is installed on the outer wall of the electrode boiler (1), the input end of the water pump (51) is provided with an inlet pipe (52) communicating with the inside of the filter chamber, and the output end of the water pump (51) is provided with an outlet pipe (53) communicating with the inside of the electrode boiler (1).
4. The downhole composite electrode steam heating device for heavy oil development in oilfields according to claim 2, characterized in that: A first motor (6) is installed on the outer wall of the water tank (3); a stirring shaft (61) extending horizontally into the processing chamber is coaxially fixed to the output end of the first motor (6); a stirring plate (62) is fixed to the outer wall of the stirring shaft (61).
5. The downhole composite electrode steam heating device for heavy oil development in oilfields according to claim 2, characterized in that: A liquid level sensor (34) is installed on the top wall of the processing chamber; a controller (35) electrically connected to the liquid level sensor (34) is installed on the top surface of the water tank (3); the controller (35) is electrically connected to the metering pump (41) and controls the operation of the metering pump (41).
6. The downhole composite electrode steam heating device for heavy oil development in oilfields according to claim 2, characterized in that: A second motor (7) is installed on the outer wall of the water tank (3); the output end of the second motor (7) is coaxially fixed with a first reciprocating screw (71) that extends horizontally into the filter chamber; the first reciprocating screw (71) is located at the top of the filter screen (42), and a cleaning brush (72) that slides and engages with the inner wall of the filter chamber is sleeved on the outside of the first reciprocating screw (71); the cleaning brush (72) is threadedly engaged with the first reciprocating screw (71) and contacts the top surface of the filter screen (42); the water tank (3) has discharge ports (36) that are flush with the top surface of the filter screen (42) on the side walls at both ends of the first reciprocating screw (71).
7. The downhole composite electrode steam heating device for heavy oil development in oilfields according to claim 6, characterized in that: The composite electrode tube (2) is coaxial with the first reciprocating screw (71); the inner wall of the electrode boiler (1) is horizontally rotatably connected to a second reciprocating screw (13) coaxial with the first reciprocating screw (71); a sliding plate (14) is sleeved on the outside of the second reciprocating screw (13) and threadedly engaged with the second reciprocating screw (13); a plurality of scraper rings (16) are fixedly connected to the outer wall of the sliding plate (14) by a connecting rod (15); the plurality of scraper rings (16) are respectively sleeved on the outside of the plurality of composite electrode tubes (2), and the scraper rings (16) are slidably engaged with the outer wall of the composite electrode tubes (2); a transmission assembly (73) is provided at the end of the first reciprocating screw (71) that can drive the second reciprocating screw (13) to rotate.
8. The downhole composite electrode steam heating device for heavy oil development in oilfields according to claim 7, characterized in that: The transmission assembly (73) includes a first pulley (731), a second pulley (732), and a belt (733); the first pulley (731) is coaxially fixed to the outer wall of the end of the first reciprocating screw (71); the second pulley (732) is coaxially fixed to the outer wall of the end of the second reciprocating screw (13); and the belt (733) is sleeved on the outside of the first pulley (731) and the second pulley (732).
9. A downhole composite electrode steam heating device for heavy oil development in oilfields according to claim 7, characterized in that: The second reciprocating screw (13) has straight plates (131) installed on the outer walls near both ends.
10. The downhole composite electrode steam heating device for heavy oil development in oilfields according to claim 1, characterized in that: The top surface of the electrode boiler (1) is provided with a power regulation module (8); the power regulation module (8) is connected in series in the circuit of the three-phase AC power supply (12) and the composite electrode tube (2).